Popular questions and responses by emy
  1. physics

    Two children are sending signals along a cord of total mass 0.50 kg tied between tin cans with a tension of 35 N. It takes the vibrations in the string 0.50 s to go from one child to the other. How far apart are the children?

    asked on November 6, 2013
  2. physics

    A 15-cm-long tendon was found to stretch 3.7 mm by a force of 13.4 N. The tendon was approximately round with an average diameter of 8.5 mm. Calculate Young’s modulus of this tendon.

    asked on November 6, 2013
  3. physics

    A house at the bottom of a hill is fed by a full tank of water 5.0 m deep and connected to the house by a pipe that is 110 m long at an angle of 58° from the horizontal (Fig. 13–48). (a) Determine the water gauge pressure at the house. (b) How high

    asked on November 6, 2013
  4. physics

    Expensive amplifier A is rated at 250 W, while the more modest amplifier B is rated at 45 W. (a) Estimate the sound level in decibels you would expect at a point 3.5 m from a loudspeaker connected in turn to each amp. (b) Will the expensive amp sound twice

    asked on November 7, 2013
  5. physics

    A fish tank has dimensions 36 cm wide by 1.0 m long by 0.60 m high. If the filter should process all the water in the tank once every 4.0 h, what should the flow speed be in the 3.0-cm-diameter input tube for the filter?

    asked on November 6, 2013
  6. physics

    ) A uniform ladder of mass m and length leans at an angle against a frictionless wall. If the coefficient of static friction between the ladder and the ground is determine a formula for the minimum angle at which the ladder will not slip.

    asked on November 6, 2013
  7. physics

    driving in a car with constant speed of 12m/s,then encounter to a bump that has a circular cross-section and a radius of 35m.find the apparent weight of a 70 kg person in the car over the top of bump

    asked on August 17, 2012
  8. Science

    What is a genetic mutuation?

    asked on February 8, 2016
  9. science

    What does the statement "the properties of salt are different from the properties of the elements that go into making them" mean?

    asked on January 12, 2016
  10. math

    Inside a long empty cylinder with radius R = 25 cm is put a long solid cylinder with radius r = 10 cm such that the bases of the two cylinders are attached. Then water is poured in the remaining empty region of the first cylinder until the height of the

    asked on February 22, 2015
  11. math

    A trough (a place where horses and sheep drink water) has the shape of a half-cylinder with length 4 m and radius 20 cm. Water is poured into the trough at a constant rate of 300 cm3/s. At what rate (in cm/s) is the level of the water in the trough rising

    asked on February 21, 2015
  12. math

    A wire of length 4 m is cut in two parts and the first part is bent in the shape of a square, while the second part is bent in the shape of an equilateral triangle. For which lengths of these parts the total area enclosed by the square and the triangle is:

    asked on February 21, 2015
  13. chemistry


    asked on October 6, 2014
  14. chemistry


    asked on October 6, 2014
  15. Chemistry

    If 25g of lead phosphate reacts with an excess of sodium nitrate, how many dreams of sodium phosphate is produced?

    asked on February 27, 2014
  16. physics

    ) A cord has two sections with linear densities of and Fig. 15–34. An incident wave, given by where x is in meters and in seconds, travels along the lighter cord. (a) What is the wavelength on the lighter section of the cord? (b) What is the tension in

    asked on November 6, 2013
  17. science

    Assuming that the cylinder is fixed at both ends and that its wall thickness is 7.5 mm, what force would be exerted by the cylinder during this change in temperature? (Note: the Young’s modulus for aluminium is 70 GPa.)

    asked on July 5, 2012
  18. science

    A hollow cylinder of aluminium 1 m long with a 40 mm outside diameter is at a temperature of 20 °C. What is the change in length and circumference of the cylinder when it is cooled to −25 °C? (Note: the thermal co-efficient of expansion of aluminium is

    asked on July 5, 2012
  19. science

    A timber specimen of 40.33 mm width,70.07 mm depth and 604mm length and its weight is 798.9g carried loads(kN): 4,6,8,10,12,14,16,18,20,22,24,25.7. and deflection(mm) 0.44,0.87,1.34,1.81,2.29,2.79, 3.39,4.17,5.42,7.21,11.02,21.94 please, 1-find density of

    asked on September 30, 2011
  20. math

    investigate the economics of using a higher grade of plywood for the facing when using timber fromwork . a fromwork system which is being used for concreting operations consumes the following labour and materials over 12 months : labour:6043 hours at

    asked on September 30, 2011
  21. math

    determine an accurate figure for the labour element ( labour hours per tonne) for fixing of (a) 10 mm, and (b) 16 mm reinforcing bar ( which, together , make reinforcement cages for the unit).it is a well established fact that the labour rate for fixing

    asked on September 30, 2011
  22. Math

    Complete to show how you can find the sum by making a ten, hundred or thousand: 9+5=__ 9+1+__ 10 +__ ______

    asked on September 7, 2011
  23. mayh

    A ship travels at a constant speed of 25 kilometres per hour (Kph) in a straight line from port A located at position (x_A, y_A) =(-100, -100) to port B at (x_B ,y_B )=(300 ,100). A) Find parametric equation for the line of travel of the ship .your

    asked on February 16, 2011
  24. math

    this question concernc the function f(x)=2x^3+15x^2+24x-21. Using the Second Derivative Test ,cassify the right-hand stationary point . please need your help thanks for reading

    asked on January 22, 2011
  25. 6th grade

    Hi im emy. What is a word problem for 4*-5?

    asked on October 16, 2010
  1. Math (7th grade math)


    posted on December 18, 2019
  2. Math

    Is 20

    posted on September 19, 2019
  3. science


    posted on January 12, 2016
  4. mechanics


    posted on December 6, 2015
  5. Math Please Help!!!

    Am i suppose to give you the answer

    posted on December 6, 2015
  6. 5th grade math

    The moon is about 240000 miles from earth. What is this distance written as a whole number multiplied by a power of ten.

    posted on September 25, 2015
  7. math

    Thank you!

    posted on February 22, 2015
  8. Math

    1/9, 1/8, 1/5, 1/4, 1/3, 1/2

    posted on February 22, 2015
  9. Trigonometry (Logarithmic Function)

    log_10(15)=log(15)/log(10) log(10)=1 log(10)=log(5*2)=log(5)+log(2)=1 log(2)=x so replacing it is log(5)=1-x then in the first part log(15)=log(3*5)=log(3)+log(5)=y+1-x so log_(10)=log(15)/log(10)=y+1-x/1 so finally it equals log_10(15)=y+1-x hope you

    posted on February 22, 2015
  10. math

    Thank you for the solution! I think the mistake is at the calculations of finding dy/dt, I think it is 0.72. Maybe I am wrong but one more time I thank you in advance.

    posted on February 21, 2015